Line adapting telegraph repeater



y 1, 1952 R. M. M. OBERMAN 2,602,117

LINE ADAPTING TELEGRAPH REPEATER Filed Aug. 6, 1947 es; 02 W1 INS n f V f B U i 5U) RELEAS u El a CI REQlSTER ZR roumm SELECTORS w JIM Patented July 1, 1952 A ..R oelof.ltitl. 2 l\'l pherman, TheHague,Netherland's I if "sectionli,fPublic Law690;.Aug-ustT8,1946 IPatcntexpires September-"2,1963

t Jv Q, sh'iwr ""The pre'sent invention =1'r1atesto a signallin "systeinjimparti'cular-a tlegraphsystem,in-which the unction lines of the subscribers-"setsand the exbh'angescth be' of' giiifererit "kin'd, :e. g. singleeurrentand double-current lines and can be through-connec'teii-in'theexchange by means-of repeaters which are adapted to the nature "of the incoming and outgoing lines.

' 'A system i's know-nin which the lines are Hiscriminatedaccoriingto their nature infourwire double current lin'es, and two wire single-current lines.- Discriminatingfrelays areprovided forthe adaptation of therepeater to "-th'eof"1ine. These relays can Joe energized "over a separate wiper *of the "finders or "selectors by earthi'ng "a contact in the-arch-df the relevant 'outlet'w-hich 'may 'be a finder or-selector. -'--A system has also -been' suggested with repeaters in the junction'circuitdf the exchange,

which can adapt them'selves to single-current 20 two-wire and four wir'e iin'es as well as 'double- -current four-wire lines; an individual compensation resistance" which --on'ly *p'resent 'in {singie current -lines i's usei as discriminatin'g-criterionj loetween the single-current fami the doulole cu-rren't lines, only three w'ip'ers --'are re- :quired at allithe 'seleotors antiffindersifor -the con- .uneotion of-zthe repeater. Y Y

'- .IThe system a'ccording to the; present invent'io .aims at an improvement in' the. arrangement o'f the;repeatersainisuchisystemslbyfderiving the discriminating-icriterion ifromxthe:transmissiomwires :themselves; v. .t Y I 1 lIn'fthis maywheinumber di wipers atfthe'finders rand :selectors necessary for the arrangement of the repeater can be restricted toLtwn. airesult -of, Ethis, --;e. g. normal v:tvsmemotion iselectors with three wiper zbrainchesvcan flaeaproviiiediin ttheisys- 'tem acpo'rding:tothe-invention.a .v

Further, .athe-tdiscriminating :criterion Jfor. the nature of the =i rfcifningr horttoutgoing 1ine,'zwhich is lderivedzfrom oneztransmission :awire ican also "serve as check on the actual presence :of that wireiine-esd 'ant1-a doub1e-current four-wire iine 1 5 -d's4. The incoming lines are 'connected to contact banks of a-cail 'finder Qz; the transmission wipers a and b of whiohare-connected'tonne-side of the repeater. --'-I-he output 'of this-sside is iormed by two conductors provided with arrows, which conductors, in cooperation with-the register,' form a iunction circuit ieading over-selectors indicated by a labelto the -other side of the 'repea'terpthe latter being in substance -equal' to the-first s'ide; -In a way similar to that in which 25 "the "incoming lines. are connected to the caii finder OZ- on the fir-st "side- 0f the repeaten' the outgoing iinesare connected to a final selector =ES on' the other side of the repeater. the

operation of the oth'er =s'iiie of -the repeater is substar-itialiy'equal to that of "the first side of the repeater, it will not b'e-described more in 'cietail.

An incoming subscribers call, which is characterizeirl at the single-current lines :by-aiine wire The otherfetransmission:wire CEIIIBJSOibE -checked in :such a mannercso"that,'rf :conse- -;quence of :a. fault the 'discrinfinating criterioniis not supplied, ;or :is suppli'edzhzrcm'gly, torxif'ronetof theg-transmissionvwireszis IOHVIOI azmder, rthe connection icannotibe :built mpzfurthen An ralarm .iIt Jisitowbe iunderstood that :in the system zaccordingitoithe'lpresentiinvention, rthe repeaters fin theexchangawhichi in a manual systemzcan -be rseiniz-aiitomatic iirr iuny' fautomatic, mot fonl y 5 v -c1osure,--and "at the double-current lines "by the -3 transmission of a r -vd1tage,- occupies in known -manner, which is not s'hown in the iirawing, -a tree junction circuit and-a free register.

l hen the'relay KBis energized by-the register, after-which a-contact iof th'e re'lay KB aper-ates the eut=oif relay of the calling -subseriber tnot *shown) and thecal-ling li-ne-is through-connected to "the contacts of the banks of lthe'scali finder. "Then-the contact lw- 'of' the relayl'K-Bthrough-- connects the -b-wiper of the icall finder over the contact ial -to the testing relay EA,

operated in the :manner hereinafter :d'escribeii.

The contacts of the c-bank of the call finder 'OZ an'd -df the =a-'=ban-ks of the final =se1ectorT.FS on the other side of i the repeater are iconnected,

transmission andlreceiving circuit and .for atomwire singl'e current:and zdoubie-ourrentrconnections to' the transmissio'n ci rcuitco'f thersub'scriber or 'of th'e other iexcha-nge. a v

Theicontactstinithe b-ibanks :ofithe call-finders,

upper winding of the relay When a single-current line calls, minus voltage is applied to the relevant contact in the a-bank, while a plus-voltage is appliedwhen a doublecurrent line calls. The contacts in the b-bank are not connected for single-current,connections or connected with minus battery, while these contacts are connected to ground for double-current connections. A discriminating relay can be energized at one of these criteria.

To check the presence of the transmission wires advantageously use can be made of the discriminating criterion over the b-wiper. The relay EA is provided for this purpose. The windingyof this relay is connected with one end to minus battery, sothat it can be energized only if the call finder is, with the b-wiper of thecall finder O-Z situated at an outlet which is con nected to ground, 1. ea doublewurrent outlet.

' Itwould be possible to switch through the circuit over the b-wiper of the call finder OZ to the repeater after a short delay of time, which is sufficient for the operation of the relay EA. However,- such a switching operation would not be compulsory so that an incorrect position of the repeater would result in case of a defect of the wire connected to the b-wiper.

The system according to my present invention renders the further succession of the switchings compulsory. U

The armature a of the polarized transmission relay A is kept during the normal position of the junction circuit in the position in which it rests against the minus pole'of the-battery, relay A being energized in a circuit fformed over the plus pole of the battery, the contacts ca l and da2, the A, the contact earl and the resistance WI to ground. The resistance WI serves as local compensation resistance for the relay A, and at the same time as current limiter for this relay when actuated under double-current conditions.

A guardingrrelay LA supervised by the armaminus battery in case such a wire is switched in, the lower winding of the polarized relay Awill be so energized that the armature a is applied tothe plus pole of the battery. Therelay LA attracts its armature and with the contact lal through-connects the wire overthe b-wiper to the repeater. The relay EA was not energized in this case.

If, however, over the contacts Icbl andkbZ a double-current line is connected to the repeater, the relay EA operates. As long as the relay EA however, is released, the polarized relay A cannot mover over its armature a against the plus pole of the battery, since no, current flows through the lower coil of this relay, because the contact or of the calling line rests against the 4 plus pole of the battery. However, as soon as the relay EA is operated, itschange-over contacts cal and ed?! switch the circuit of the polarized relay A, the armature a is placed against the plus pole of the battery. The relay LA operates and with the contact lal connects the b-wire to the repeater, while with the-contact laZ, a holdingcircuit is formed fortherelay EA; The relay LA is a slow releasing guarding relay which cannot release before the armature a has been resting during a certain time against the minus pole of the battery. I

As well for" single-current as for double-current circuits, theconsecutive switchings take place in, a, compulsory manner. If after the operation of the relay KB during a period of time which isequal to the time of operation of the relay EA, the polarized relay A and the guarding relay LA, the latter is not operated, there is a fault which can be efi'ectively announced by an alarm in a known manner. For the sake of completeness it' is remarked that for single-current lines after, the operation of theLA relay,the relay D'A operates in a circuit from earth, over the contacts m2, eaB and ca, andthe winding of the relay DA to minusbattery. The repeater, which in the normal position is in'the single-current four-wire position, is. then switched over by the contacts dal and deal into the single-current twowire situation. If the subscriber indicates that on his side the four-wire situation of the line is desired, the circuit over the b-wiper in the subscribers set is closed, and the relay CA is energized in a circuit of plus battery in the exchange, the contactdal, the relay CA, the contacts Ia3, lal, kbZ, the b-Wiper of call finder OZ, and the subscribers line to minus battery, in the exchange. Owing to the release of the contact ca, the relay DA is released.

I The calling subscriber can now transmit the series of selecting impulses to the receiving relay 0 in the register, after which the establishment of the desired connection follows;

After this establishment and after the freetest of the subscriber to becalled the contacts loci and 7002 through-connectthe .aand bewipers of the final selector to the otherside of the repeater (the'lower side in the drawing) after which a similar switching as in theu first side of the repeater (the upper side in the drawing) takes tact (not shown) and switches the. connection through bymeans of the contacts kdlaand kdZ. WhatI claim as new and desire to secure by Letters Patent is:

. l. A signalling system, comprising in combination, a plurality of twoewiresingle-current lines; a plurality of four-wire single-current lines; a plurality of four-wire double-current lines; an exchange; arepeater'in-said exchange; means for adapting said'repeater in said exchange automatically to any ofsaid lines, said means includingv a relay discriminating between said singlecurrent .lines andsaid double-current lines; a first wiper and a first'contact bank arranged for cooperationwith said firstwiper, said first'contact .jbank' having "contacts? connected, respectively, to. saiditwo-wire single-currentv lines, said four-wire single-.currentrlines'and said four-wire double-current lines; a second wiper and a second contact bankarrangedfor. cooperation with said second wiper, saidzsecond contact bank including contacts connected, respectively, to said four-wire single-current lines and said fourh arfi', 'es" c6nnected tofsaid' contacts of fc'ontactjb'ank'; and means for c tact with mg tussle twig-wire sin'gl'e-curie I connected waste-tn fe'nd's "w the axn'e twenty said Contact banks belonging I si'ngle current line's, and-conn cted With onejefld "to one polarity 'ahdwith the ether 'Ehdfo a d ifi'feat .fiblliity when said wipers are inbbritaet with contacts of said contact banks belbfigin'g to said roar-wire double-current lines "so "that said. dissi' m'im m y .d j eei starc two-wire and four-wire single-current lines by change. automatically to any of said lines, said m a n in 1 1 4 i v fm pfl i p .ib

said single-current lines and;said double-currentlines; a first wiper anda first contact bank arranged .for cooperation with said firstwiper, saidrf rst contact bank having 'con-tactsi con- Jhected -respectitzely, to said two-wire singleicu rrent lines, said -four-jwire single current lines and said "iourwire double-current lines; a second wiper and a second contact-bank arranged for cooperation with sai d second wiper, said second contact bank including contacts connected, respectively, :to 'said Tour-wire singlecurrent lines and said four-wire double-current lines", said contacts 'of "said "second tanner bank connected to said four-wire single-"current lines having a negative polarityptlfepblarity of said contacts of said secondcon-tact bank connected-to said [four-wire double'ecuri'ent z'lines being *the polarity of ground; means for imparting to one end of said discriminating relay a negative polarity bein equal to the negative polarity of said four-wire single-current lines connected to said contacts of said second contact bank; and means for connecting the other end of said discriminating relay to said second wiper, whereby said discriminating relay is in an open circuit when said wipers are in contact with contacts of said contact banks belonging to said two-wire single-current lines, and connected with both ends to negative polarity when said wipers are in contact with contacts of said contact banks belonging to said four-wire single-current lines, and connected with one end to negative polarity and with the other end to ground polarity when said wipers are in contact with contacts of said contact banks belonging to said four-wire doublecurrent lines so that said discriminating relay discriminates between said two-wire and fourwire single-current lines by being deenergized and said four-wire double-current lines by being energized.

" cciifpfising m commfinds a ty' Wi resingle-c rrent line's; 'a-"p1urality-"of 'foiir wi're esume-current lines an exchange a peater insaid exchange; -means for asap ng change automatically 17i) an of Said line's, said "means including a relay discriminating between samsi-ng1e-earreiit lines -*and sa'id double -curarranged-Tor cooperation with -"s'aid first "wiper, "sai-dfirstbontact bank liaiyi i 'g contacts can- "neted, respectively, t'o said Wit!-'Wi1'*e singlecurrent lines, said foin' wi re 'single-c-urrent lines and Said fdlir-wifeiiduble-cil'rrfitdines; asecond wiper and a seeon ccntact bank arranged for eddpei'at'tidn with "said 'sbdnd 'Wi'p'ei, Said second contact bank including contacts connected, 're- "spectively, to said"four wi're single-current lines andsaid foujr -wiredouble-current lines, sat-meanwas or said seeaa cont ct ba'nk connected to said four-wire single-current l'i'ri'es having -a polarity -difie'ren-t from the polarity of s'ai'd contacts {of said second contact ban-k connected to said Tour-wire double-current line's; means for 'izn'parti'ng to omen- 1 of "said discriminating reny a polarity being equa to the polarity or said rcur=wi-re-sing1e-current "lines connected to "said cdntadts or said sec ira "contact bank; means f r connecting the other 'nddf s'aid' discrimimating relay t'o said -=second wiper; ja slow releasing relay; and "a"c6htat*'(idntr01 1'ed -by "said low"rel asing reiayanwhavmga first enaposr- 'tion and a second -'nd position, sai "contact forming in the first-end *pos'ifti'on'thereo'f part-of Said me'an's conn'ec ng thebtfiereflddf said'discriininating relay said second wiper, said 1 contact connecting "1 theothei 'nd position thereof "sam secdn'a wip'ejr to-sai repeater, whereby 's'ai'd discriminating relay is in an open circuit when said wipersare in contact with -cont'acts of said Tcont'ac t banks belonging to said 'two wir'e singlecuire'nt lines, and "connected with "both nds "176 the same "polarity when {said iwipe'r's "are m contact with contacts-of said contact banks belon ing to said four-wire single-"current lines, and

connected with bn'e' na teen-e 'pbl'arityelnd With the other e nd to -a iiiifrent polarity Wh'nsaid "w ilirsare in contact contacts of "said contact "banks belonging? -0 sa d rounwire dbiiblecurient'-'lines so that said -discriii'iinating "relay discriminates petw'e n -saiii two i'liri'rfe and fourand said four-wire double-current lines by being energized.

4. A signallin system, comprising in combination, a plurality of two-wire single-current lines; a plurality of four-wire single-current lines; a plurality of four-wire double-current lines; an exchange; a repeater in said exchange; means for adapting said repeater in said exchange automatically to any of said lines, said means including a relay discriminating between said singlecurrent lines and said double-current lines; a first wiper and a first contact bank arranged for cooperation with said first wiper, said first contact bank having contacts connected, respectively, to said two-wire single-current lines, said four-wire single-current lines and said four-wire doublecurrent lines; a second wiper and a second contact bank arranged for cooperation with said second wiper, said second contact bank including contacts connected, respectively, to said fourwire single-current lines and said four-wire d0uble-current lines, said contacts of said second wo wiie single-current 7 said zre eater in said ex- 7 ntac bmknonnect in l our-wi s n uxre t li e a n a, p l ri d f e t mm the p lar ty an -c n a s ai eew e t a bank connected to said four-wire; double-current lines;- n forli n rt e t he en (if said di .criminating relay -polarity beingeqnal to; 'polari p rsa rrwi e em fl -fie em wa con ec d 1 .sa. cont ts pf a d as e @9 tactbank; means ior connectingthe other end of sai d m ative fFilae to .S Second fil';

slow releasing ,lay a c ontact controlled by said c n te w th; hen s tulle S Po t when said wipers are in contact .with contacts of said contact banks belonging toj said four wire single-current lines, and connected with one end to. one polarity and with the v otl ier end 'ito a different polarity Whensaid wipers are in contact with contacts of said contact banksbelonging to saidiour-wire doublecurrent lines so that said discriminating relay discriminates between said two-wire and tour-wire single-current lines by being de-energized and said four-wire doublecurrentlinesby being energized; i a I a 5. A signalling system, comprising incombination, a plurality of two-wire single current lines; a plurality iour wiresingle-current lines;- a plurality of'four-wire double -current lines; an exchange; a .repeater in said exchange; means for adaptin said, repeater insaid exchange automatically to v any; of said lines, said means including a, relay discriminating between said single-current lines and said double current lines; a first wi'per and a. first contact bankarranged ror cooperation with said: first wiper, said first c mment ng haying contacts connected, re.- spectivelyyto said: two w'ire single-current lines, said four-wire singlecurrentlines and said fourwire 'double -cnrrent: lines; a second wiper and a second contact bank arranged for cooperation with said second wiper, said second contact bank including,- contacts connected respectively, to

from the bola said four-wire single-current lines and said fourwirefdouble-current lines, Ysaid contacts of said secondcontact bank connected to said four-wire single curr'ent" eshaving a polarity difierent 'ofsai'd contacts of said'second contact bank" nnectedtolsaid four-wire doublecurrent "lines eans forir'npa'rting to one end of said clis'criinniatirig1.relay, a polarity being equal to" the polarity of. said four-wire single-current line's connectedfto said contacts of said second contact bank} means'fifor connectin the other end of said discriminating'relay to said' second wiper; aislow releasing relay; a contact controlled by said'slow releasing relay, and having a first end position and a second end position, said contact 'formingin the first end position thereof part'of said. means connecting the other end of said' discriminatingjrelay to said second wiper, said contact connecting in the other end position thereof said second wiper to said repeater; a polarized relay including a contact controlling said slow releasing relay, said polarized relay having two windings; means for energizing one of "said windings by'a' stronger current than the other of said windings when a single-current transmission route is established; and means for energizing both said windings in series to each other when a double-current transmission route is established; wherebysaid discriminating relay is in an open circuit when said wipers are in contact with contacts of said contact banks belonging to saig'iftwo-wire single-current lines, and connected withlboth ends to the same polarity when'said wipersare in contact of said contact banks belonging to :saidfour-wire single-current lines, and-connectedwith one end to one polarity v and With-the other ;end to a different polarity whenf'said f-wipersarein contact'with contacts of said contact ban'ks belonging 'to said four-wire double current "lines so -th'at said discriminating relay-discriminates between said two-wire "and four-wire single-current lines by being de-ener- 'gized and said four-wire double-current lines by being energized; r 1

3 I M .M.OBER1VIAN. f REFERENCES o rrian ThefioHowing'references are of record in the file oi this patent;

' a -E RE GN-JPA E .Number- Country Date 531,902 Great. Britain Jan. 14, 1941 

